PURPOSE: To protect a display picture drawing part and an originating part at the time of being not used, from a damage or a maloperation due to a carelessness by covering automatically the not used one between a dial originating part using a juxtaposed ten key and the display picture drawing part, with a cover.

CONSTITUTION: The dial originating part 3 and the display picture drawing part 4 are mounted on the upper surface of a main body 1 in a lateral direction, standing side by side. Guides 6a, 6b are protruding guides formed in parallel with the line direction and on both the sides of the dial originating part 3 and the display picture drawing part 4. The cover 7 is slide-freely engaged with these guides 6a, 6b. The cover 7 has a size to cover only one of the dial originating part 3 and the display picture drawing part 4. When the cover moves to the dial originating part 3 side, it covers the upper part of the dial originating part 3, and when it moves to the display picture drawing part 4 side, it covers the upper part of the display picture drawing part 4 respectively. Accordingly, the display picture drawing part 4 is protected from the damage due to the carelessness when it is not used, and besides, when the display picture drawing part 4 is used, a trouble that the dial originating part 3 is operated by mistake disappears.